Yamaha SIGMA-G5SII Service Information page 97

(4) Remove the bolt from the coupling connecting the motor and ball screw located on the
right side of the X-axis to separate the motor from the unit. Loosen the setscrew of the
lock nut using the hexagon wrench (#2).
Note:
Take care not to lose the ball axis scratch preventive spacer.
(5) Insert the hexagon wrench (#4) into the gap at the end of the ball screw and stop the
ball screw turning. Then, loose the lock nut using a spanner to remove.
M3 Setscrew
Lock nut
(6) Loosen the setscrew for the lock nut using the hexagon wrench (#2).
Note:
Take care not to lose the ball axis scratch preventive spacer.
(7) Insert the hexagon wrench (#4) into the gap at the end of the ball screw and stop the
ball screw turning. Then, loosen the lock nut using a spanner to remove.
(8) Turn the ball screw using the hexagon wrench with the spanner placed, to remove the
lock nut. The collar is included in the block. Take care not to lose the collar.
M3 Setscrew
Lock nut
(9) Slide the ball screw axis about 20mm to the opposite side of the motor.
Fig. C20
Fig. C21
Fig.C22
97/273
For Service Engineer
Service Information
M3 Bolt
Servo motor
Turn the lock nut by means of
putting the spanner on the
specified block.
SI1705004E-00=SIGMA-G5SII Service Manual